RU153106U1 - DEVICE FOR PREPARATION OF OIL-FIELD WATERS FOR SYSTEM OF SUPPORT OF PLASTIC PRESSURE OF OIL DEPOSITS - Google Patents

Abstract

1. A device for preparing oilfield water for a system for maintaining reservoir pressure of oil fields, comprising a hydrocyclone, a ferromagnetic ring filter with a power source, a pressure and electrochemical flotator, a filter with calibrated holes, ultraviolet lamps, a clean water tank, an electrochemical filter, characterized in that the device additionally contains an electrolyzer for wastewater treatment, which is loaded with siliconized calcite, inside which electrodes made of electropositive and electronegative materials, representing electrochemical current sources, where the electronegative electrode is made of magnesium, the electropositive electrode is made of graphite. 2. The device according to claim 1, characterized in that in the electrolyzer loaded with silicified calcite of a fraction of 2-5 mm, inside which electrodes of electropositive and electronegative materials are uniformly placed, representing electrochemical current sources where the electronegative electrode is made of magnesium, the electropositive electrode is made of graphite, their number is 8.

Description

The utility model relates to the field of purification of oil-containing water and can be used for wastewater treatment of oil-producing enterprises and the preparation of oilfield water for the system of maintaining reservoir pressure of oil fields.

The invention is known (Patent RU 2325330) relating to methods and devices for the treatment of oily wastewater, in particular reservoir, commercial and storm sewage of oil fields. The produced water is purified by sedimentation from the Sand fractions, followed by filtration in a magnetized granular ferromagnetic material forming a closed magnetic circuit and located in an external magnetic field, the coagulant is dosed, floated with dissolved gas bubbles due to pressure relief, and flotation is carried out sequentially in several sections. Dissolved aggressive gases are extracted by vacuum, and bactericidal preparations are dosed.

The disadvantage of the invention is the low degree of purification of oily waters.

The closest solution to the problem is a device for treating oilfield waters for a system for maintaining reservoir pressure of oil fields (Patent for PM No. 120645).

The device contains a hydrocyclone, a ferromagnetic ring filter with a power source, a pressure-electrochemical three-section flotator, a filter with calibrated holes, ultraviolet lamps, a clean water tank, a reagent farm, an electrochemical filter. To concentrate petroleum products collected by a hydrocyclone and a flotator, the device contains a hydrophobic filter, and a drive is used to collect them. For dewatering sludge and solids, the device contains a shelf sump and a filter press. The device includes a pumping station, flushing and drainage pumps.

The disadvantage of this device is the low degree of purification of oily water.

The objective of the utility model is to increase the degree of wastewater treatment.

The technical result consists in increasing the cleaning efficiency and in generating electricity, which is used for the process automation system.

The specified technical result is achieved by the fact that in the known device for preparing oilfield water for a system for maintaining reservoir pressure of oil fields containing a hydrocyclone, a ferromagnetic ring filter with a power source, a pressure and electrochemical flotator, a filter with calibrated holes, ultraviolet lamps, a clean water tank, an electrochemical filter, hydrophobic filter, oil storage device, sludge dewatering device, the feature is that the device optionally contains an electrolyzer for wastewater treatment, which is loaded with siliconized calcite, inside which electrodes from electropositive and negative electrons are uniformly placed, which are electrochemical current sources, while in an electrolyzer loaded with siliconized calcite of a fraction of 2-5 mm, the electronegative electrode is made of magnesium, the electropositive electrode is made of graphite, and their number is 8.

The figure 1 shows a diagram of a device for the preparation of oilfield water for the reservoir pressure maintenance system.

The structure contains a series-connected hydrocyclone 1, a ferromagnetic ring filter 2 with a power supply, a pressure electrochemical three-section flotator 3, a filter 4 with calibrated holes, an electrolyzer for wastewater treatment 5, ultraviolet lamps 6, a clean water tank 7, a reagent farm 8, an electrochemical filter 9. Petroleum products collected by hydrocyclone 1, flotator 3, enter the hydrophobic filter 10 and, after concentration, enter the reservoir 11. The sediment from the hydrocyclone 1 and flushing I water of the ferromagnetic filter 2 enters the shelf sump 12, and after dewatering in the filter press 13. The structure contains a pump station 14, washing pumps 15, drainage pumps 16.

The device operates as follows. Oilfield water is supplied to hydrocyclone 1, where oil and suspended solids are separated. Next, the water enters the ferromagnetic ring filter 2, loaded with ferromagnetic chips, for example, crushed ferrite. Due to the action of electromagnetic forces, pollutants are fixed on the filter load. A feature of the filter is its high dirt capacity and high filtering rate. In a ferromagnetic filter, a reaction of iron and hydrogen sulfide occurs with the formation of iron sulfide in the form of suspended solids extracted by the filter.

After mechanical cleaning, water enters the combined pressure-electrochemical three-section flotator. In the first section, pressure flotation occurs with hydrogen sulfide bubbles formed by pressure relief. In this case, water is purified from suspended solids and oil, as well as hydrogen sulfide extraction.

In the second and third sections of the pressure-electrochemical three-section flotator, flotation occurs with gas bubbles formed by the electrode pair. Electrode pair is an electrochemical source of energy, due to which electrolysis of water occurs with the formation of gas bubbles, floating pollutants. The electrode pair consists of a plate of electropositive carbon-containing material - graphite and parallel wires of an electronegative metal - magnesium.

Extraction of mechanical impurities larger than a predetermined limit value occurs due to filtering in strainers 4 with calibrated holes. The extraction of organic impurities and ions of heavy and non-ferrous metals occurs in the electrolyzer for wastewater treatment 5, with electrodes forming electrochemical current sources and consisting of rods of electronegative materials - magnesium and electropositive materials - graphite, and the electrolyzer is loaded with a mineral granular active charge, as which use silicified calcite fractions of 2-5 mm. The effect of water purification is increased due to electrochemical sources of current: the process of flocculation increases, oxidation-reduction processes occur in the electrode space of the electrolyzer, filtering material sorb heavy metals ions and oxidation products of organic compounds due to polarization. The number of electrochemical current sources is 8.

Disinfection of water from sulfate-reducing bacteria occurs with ultraviolet lamps 6, after which water is accumulated in a clean water tank 7 for technological needs, in particular, for regenerating the loading of a ferromagnetic ring filter 2, an electrochemical filter 9 and an electrolyzer for wastewater treatment 5. Rinsing water from a ferromagnetic ring filter 2 and sediment from a hydrocyclone 1 are dehydrated by a shelf settler 12 and a filter press 13.

Oil recovered by hydrocyclone 1 and a pressure-electrochemical three-section flotator 3 is dehydrated in a hydrophobic filter 10 and accumulated in the reservoir 11. Drainage water is supplied to the head of the structures by drainage pumps 16.

Water purification is carried out by an electrochemical filter 9 with a mineral granular active charge, which is used as a silica calcite of a fraction of 2-5 mm, before which a coagulant is dosed using a reagent farm 8. Electrochemical current sources are created in the body of the electrochemical filter, which increase the effect of water purification. Electrochemical current sources consist of electrodes made in the form of parallel arranged perforated disks made of electropositive, for example, graphite, and electronegative, for example, aluminum, materials. The number of electrochemical current sources is 5.

Example. Purified oil field water according to the prototype and utility model. The source water had the following quality: solids - 1160 mg / l; petroleum products - 360 mg / l; hydrogen sulfide - 930 mg / l; sulfate-reducing bacteria - 103 mg / l; iron - 47 mg / l; zinc - 15 mg / l; nickel - 0.05 mg / l; copper - 10 mg / l; organic dye - 0.7 mg / l; benzene - 2500 mg / l.

The results of the experiments are shown in table 1.

Table 1 Pollutant unit of measurement Content after cleaning Additional effect by utility model,% prototype utility model Mechprimesi mg / l one one 0 Oil products mg / l 0.5 0,075 85.0 Hydrogen sulfide mg / l 2 2 0 Sulfate-reducing bacteria mg / l 3 3 0 Iron mg / l 0.3 0.1 66.7 Particle size of solids μm 5 5 0 Zinc mg / l 10 0.01 99.9

Nickel mg / l 0.17 0.1 42.1 Copper mg / l 0.5 0.014 97.3 Organic dye mg / l 0.17 0.1 41.2 Aromatic hydrocarbons - benzene mg / l 0.55 0.3 48.5

From the above results it follows that the use of the device improved the quality of treated water for oil products, iron, zinc, nickel, copper, organic dye, benzene. The remaining indicators have not changed. Thus, the quality of water has changed in terms of those indicators that lead to the formation of muds. If this is obvious for petroleum products, then for zinc, nickel and copper it needs to be clarified. Under formation conditions, metals react with hydrogen sulfide to form metal sulfide crystals, the sizes of which exceed the dimensions of the pore channels of the formation rock, which reduces the injectivity of the well due to formation mudding.

The technical result consists in increasing the efficiency of purification of petroleum products, iron, zinc, nickel, copper, organic dye, benzene due to the fact that the device additionally contains an electrolyzer for wastewater treatment, generating electricity.

Claims (2)

1. A device for preparing oilfield water for a system for maintaining reservoir pressure of oil fields, comprising a hydrocyclone, a ferromagnetic ring filter with a power source, a pressure and electrochemical flotator, a filter with calibrated holes, ultraviolet lamps, a clean water tank, an electrochemical filter, characterized in that the device additionally contains an electrolyzer for wastewater treatment, which is loaded with siliconized calcite, inside which electrodes made of electropositive and electronegative materials, representing electrochemical current sources, where the electronegative electrode is made of magnesium, the electropositive electrode is made of graphite. 2. The device according to p. 1, characterized in that in the electrolyzer loaded with silicified calcite of a fraction of 2-5 mm, inside which electrodes of electropositive and electronegative materials are uniformly placed, representing electrochemical current sources, where the electronegative electrode is made of magnesium, an electropositive electrode made of graphite, their number is 8.

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